Metal alloy.



UNITED srAtrEis PA E T OFFICE.

HUGH S. COOPER, F CLEVELAND, OHIO, ASSIGNOR TO THE ELECTED METALS PROD- UCTS COMPANY, OF CLEVELAND, OHIO.

METAL ALLOY.

No Drawing.

To all whom it may concern:

' State of Ohio,

Be it--known that I, HUGH S. Coornn, a citizen of the United States, residing at Cleveland, inthe county of Ouyahoga and have invented certain new and useful Improvements in Metal Alloys, of which the following is a specification.

V My invention appertains to a metal alloy adapted to be used as a substitute for plati-- num in the electrical art, as in coils, magnetos and all vibrating instruments, and the invention consists of a composition of silver and other metals which is ductile, and malle able, and of comparatively high melting point, good electrical conductivity, great hardness, non-oxidizing, and producible at a low cost.

In all compositions of alloys known to me in which silver enters, copper is also used butI find that this composition oxidizes very readily making it useless for electrical contact purposes, especially where the contact is exposed to high temperatures and severe usage. I also find that it is not practicable to use silver alone as it is too soft and the melting point islnot high enough. However, silver is a good electrical conductor and relatively cheap as compared with platinum and when alloyed in proper proportions with other metals as hereinafter described serves as an excellent substitute for platinum. One such composition comprises silver, palladium and cobalt, in substantially the following proportionsi seventy'per cent. of silver, twenty-five per cent. of palladium,'and 'five per cent. of cobalt. Platinum may be substituted for thepalladium with equally good Specification of Letters Patent nickel Application filed August 14, 1915. Serial No. 45,526.

results, and nickel for thecobalt, but I prefer palladium as it may be obtained at a lower cost than platinum. I also prefer cobalt'as I find it resists oxidization at a higher temperature than nickel, and it also makes a harder alloy. In this" alloy I use.

as little of platinum or palladium as possible consistent with the durability and lasting qualities of the product, and I also find that three to five per cent. of cobalt or nickel is suflicient to furnish the hardness necessary.

'What I claim is:

1. An alloy for electrical uses, comprising silver and one or more of the metals of the platinum group and a metal of the cobaltgroupin substantially the proportions stated.

2. An alloy for electrical uses conta' silver, palladium, and a metalof the cobaltnickel group in the proportions substantially set forth.

3. An alloy for electrical contact purposes composed of silver, palladium, and cobalt 1n approximately the proportions .stated as to make the alloy hard, heat resisting, nonoxidizing and a good electrical conductor.

4. A metal alloy composed of.-;seventy per cent. of; -silver,'twenty-five per cent. of 'palladiuml and five per cent. cobalt.

In testimony whereof I HUGH S. COOPER. Witnesses: J. W. FnasER, R. B. .Mosnn.

aflix my signature 7 in presence of two witnesses. 

